cookie domains storage

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VS2005

C#

Visual-Studio

Hi, I have trouble setting cookies domain. When I do they are not being saved. If I comment out the line of code that sets the domain the cookies are stored. I am trying to get my cookies stored with their same subdomain name in the cookies folder. Using XP prof, Visual Studio 2005. The domain name I use is correct for the subdomain of the web page running the server side script, but this example has a fictitious name. Maybe the server thinks the domain is different?? Or is "container" a keyword??
Thanks.

protected void setCookie()
{  
 HttpCookie cookie = new HttpCookie("data");
 cookie.Domain = "container.mySite.com";
 cookie.Path = "/container";
   
 cookie.Values["tb1"] = TextBox1.Text;
 cookie.Expires = DateTime.Now.AddHours(1);
 Response.Cookies.Set(cookie);
}